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D01-27

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D01-27  [#permalink]

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New post 16 Sep 2014, 00:12
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

91% (00:58) correct 9% (01:39) wrong based on 128 sessions

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It takes computer A 6 hours and 40 minutes to finish a job. If computer B can process the same job in 10 hours, how long will it take, for both computers working together, to finish the job?

A. 6 hours and 20 minutes
B. 5 hours and 10 minutes
C. 4 hours and 40 minutes
D. 4 hours
E. 3 hours and 20 minutes

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Re D01-27  [#permalink]

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New post 16 Sep 2014, 00:12
1
Official Solution:

It takes computer A 6 hours and 40 minutes to finish a job. If computer B can process the same job in 10 hours, how long will it take, for both computers working together, to finish the job?

A. 6 hours and 20 minutes
B. 5 hours and 10 minutes
C. 4 hours and 40 minutes
D. 4 hours
E. 3 hours and 20 minutes


After rewriting the time needed to finish the job in minutes, we construct an equation:
\(\frac{1}{400}+\frac{1}{600} = \frac{3+2}{1200} = \frac{5}{1200} = \frac{1}{240}\)

240 minutes equals 4 hours.


Answer: D
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: D01-27  [#permalink]

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New post 03 Sep 2018, 18:32
The Solution is helpful. btw which level questions are these?
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Re: D01-27  [#permalink]

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New post 03 Sep 2018, 23:49
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Re: D01-27 &nbs [#permalink] 03 Sep 2018, 23:49
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